// Copyright 2008 Thiago H. de Paula Figueiredo
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package br.com.arsmachina.tapestrycrud.hibernate.factory;

import java.io.Serializable;

import org.apache.tapestry5.PrimaryKeyEncoder;
import org.hibernate.SessionFactory;

import br.com.arsmachina.controller.Controller;
import br.com.arsmachina.module.service.ControllerSource;
import br.com.arsmachina.tapestrycrud.factory.PrimaryKeyEncoderFactory;
import br.com.arsmachina.tapestrycrud.hibernate.encoder.HibernatePrimaryKeyEncoder;

/**
 * {@link PrimaryKeyEncoderFactory} implementation using Hibernate.
 * 
 * @see HibernatePrimaryKeyEncoder
 * @author Thiago H. de Paula Figueiredo
 */
public class HibernatePrimaryKeyEncoderFactory implements PrimaryKeyEncoderFactory {

	final private SessionFactory sessionFactory;

	final private ControllerSource controllerSource;

	/**
	 * Single constructor of this class.
	 * 
	 * @param sessionFactory a {@link SessionFactory}. It cannot be null.
	 * @param controllerSource a {@link ControllerSource}. It cannot be null.
	 */
	public HibernatePrimaryKeyEncoderFactory(SessionFactory sessionFactory,
			ControllerSource controllerSource) {

		if (sessionFactory == null) {
			throw new IllegalArgumentException("Parameter sessionFactory cannot be null");
		}

		if (controllerSource == null) {
			throw new IllegalArgumentException("Parameter controllerSource cannot be null");
		}

		this.sessionFactory = sessionFactory;
		this.controllerSource = controllerSource;

	}

	@SuppressWarnings("unchecked")
	public <T, K extends Serializable> PrimaryKeyEncoder<K, T> build(Class<T> entityClass) {

		PrimaryKeyEncoder<K, T> encoder = null;

		if (sessionFactory.getClassMetadata(entityClass) != null) {

			Controller<T, ?> controller = controllerSource.get(entityClass);

			if (controller != null) {
				encoder = new HibernatePrimaryKeyEncoder(entityClass, controller, sessionFactory);
			}

		}

		return encoder;

	}

}
